US2981722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of vinylchloride polymers by dispersion processes in aqueous media
Assignee: Wacker Chemie AG
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Filing: 1957-10-07
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Granted: 1961-04-25
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Expires: 1977-10-07
Abstract
No abstract record available.
Inventors
- 👤 Enk Eduard
- 👤 Reinecke Herbert
- 👤 Kurz Eduard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:44
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN A PROCESS FOR THE PRODUCTION OF DISPERSIONS OF POLYVINYL CHLORIDE AND COPOLYMERS OF VINYL CHLORIDE WITH VINYL ACETATE, THE STEPS WHICH COMPRISE FORMING AN EMULSIFIABLE AQUEOUS REACTION MIXTURE CONTAINING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND OF MIXTURES THEREOF WITH VINYL ACETATE, A MONOMER SOLUBLE CATALYST AND AN EMULSIFYING AGENT, AGITATING THE MIXTURE WHILE BELOW POLYMERIZATION TEMPERATURE TO FORM AN EMULSION IN WHICH LESS THAN ALL OF THE EMULSIFIABLE MONOMER PRESENT IS EMULSIFIED, ALLOWING THE EMULSION TO STAND AND THE UNEMULSIFIED MONOMER TO SEPARATE AS A SURFACE LAYER, REMOVING THE SEPARATED UNEMULSIFIED MONOMER LAYER, HEATING THE MONOMER EMULSION WITHOUT AGITATION TO A POLYMERIZATION TEMPERATURE OF AT LEAST 45*C. TO CAUSE SAID EMULSIFIED MONOMER TO UNDERGO POLYMERIZATION AND FORM A DISPERSION OF POLYMER PARTICLES, AND SEPARATING THE POLYMER PARTICLES FROM THE AQUEOUS PHASE BY FILTRATION.
Claim 2
Dependent Claim
139 words
IN A PROCESS FOR THE PRODUCTION OF DISPERSIONS OF POLYVINYL CHLORIDE AND COPOLYMERS OF VINYL CHLORIDE WITH VINYL ACETATE, THE STEPS WHICH COMPRISE FORMING AN EMULSIFIABLE AQUEOUS REACTION MIXTURE CONTAINING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND OF MIXTURES THEREOF WITH VINYL ACETATE, A MONOMER SOLUBLE CATALYST AND AN EMULSIFYING AGENT, AGITATING THE MIXTURE WHILE BELOW POLYMERIZATION TEMPERATURE TO FORM AN EMULSION IN WHICH LESS THAN ALL OF THE EMULSIFIABLE MONOMER PRESENT IS EMULSIFIED, ALLOWING THE EMULSION TO STAND AND THE UNEMULSIFIED MONOMER TO SEPARATE AS A SURFACE LAYER, REMOVING THE SEPARATED UNEMULSIFIED MONOMER LAYER, HEATING THE MONOMER EMULSION WITHOUT AGITATION TO A POLYMERIZATION TEMPERATURE OF AT LEAST 45*C. TO CAUSE SAID EMULSIFIED MONOMER TO UNDERGO POLYMERIZATION AND FORM A DISPERSION OF POLYMER PARTICLES, AND SEPARATING THE POLYMER PARTICLES FROM THE AQUEOUS PHASE BY FILTRATION.
References Cited (Backward Citations)
US2426422A
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US2496384A
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US2520959A
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GB638640A
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US2771457A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |